EGG REJECTION BY COWBIRD HOSTS IN GRASSLANDS
作者： Scott K. Robinson , Brian D. Peer , James R. Herkert
DOI: 10.1642/0004-8038(2000)117[0892:ERBCHI]2.0.CO;2
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摘要: Abstract We tested Field Sparrows (Spizella pusilla), Vesper (Pooecetes gramineus), Lark (Chondestes grammacus), Grasshopper (Ammodramus savannarum), Dickcissels (Spiza americana), Eastern Meadowlarks (Sturnella magna), and Western (S. neglecta) to determine whether the low level (<10%) of observed parasitism by Brown-headed Cowbirds (Molothrus ater) on these grassland hosts is a result egg rejection. rejected 78% artificial real cowbird eggs, 36% 11% eggs. None other regularly Thus, rejection may account for some, but not all, in Midwest. were also with nonmimetic remaining undersized mimetic eggs when possible. All hosts, exception Sparrow, ...
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